function tolower(c) defined in library works for ___________.

1.	function tolower(c) defined in library works for ___________.
A.	Unicode character set
B.	Ascii and utf-8 but not EBCDIC character set
C.	Ascii character set
D.	Any character set
E.	None of these
Answer» E. None of these

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function tolower(c) defined in library works for ___________.

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